CVE-2016-20026

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-16. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

ZKTeco ZKBioSecurity 3.0 contains hardcoded credentials in the bundled Apache Tomcat server that allow unauthenticated attackers to access the manager application. Attackers can authenticate with hardcoded credentials stored in tomcat-users.xml to upload malicious WAR archives containing JSP applications and execute arbitrary code with SYSTEM privileges.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

March 16, 2026

Last Modified

July 28, 2026

Advisory Details (6)

Auto-updated Sep 1, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

ZKTeco ZKBioSecurity 3.0 Hardcoded Credentials Remote Code Execution | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-hardcoded-credentials-remote-code-execution
generic🟡 PoC Available

ZKTeco ZKBioSecurity 3.0 - Hard-Coded Credentials SYSTEM Remote Code Execution - JSP webapps Exploit

https://www.exploit-db.com/exploits/40324/
generic

Locked Out | Packet Storm

https://packetstormsecurity.com/files/138567
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/116484
generic

ZKTeco ZKBioSecurity 3.0 Hardcoded Credentials Remote SYSTEM Code Execution - CXSecurity.com

https://cxsecurity.com/issue/WLB-2016080266
generic🔴 Active Exploitation

Zero Science Lab — Information Security Research & Development Laboratory

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5362.php

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 56× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 201 total refreshes for this CVE.

  1. 2026-09-04 13:56 UTCEPSS rescore
  2. 2026-09-02 14:07 UTCEPSS rescore
  3. 2026-09-01 03:31 UTCEPSS rescore
  4. 2026-08-30 19:12 UTCEPSS rescore
  5. 2026-08-27 14:20 UTCEPSS rescore
  6. 2026-08-26 14:41 UTCEPSS rescore
  7. 2026-08-25 13:44 UTCEPSS rescore
  8. 2026-08-23 00:13 UTCEPSS rescore
  9. 2026-08-21 23:44 UTCEPSS rescore
  10. 2026-08-19 16:59 UTCEPSS rescore
  11. 2026-08-18 13:43 UTCEPSS rescore
  12. 2026-08-17 13:42 UTCEPSS rescore
  13. 2026-08-16 14:51 UTCEPSS rescore
  14. 2026-08-16 11:33 UTCEG score recompute
  15. 2026-08-16 11:33 UTCGHSA enrichment
  16. 2026-08-16 02:09 UTCEPSS rescore
  17. 2026-08-15 01:25 UTCEPSS rescore
  18. 2026-08-14 23:45 UTCGHSA enrichment
  19. 2026-08-14 20:03 UTCGHSA enrichment
  20. 2026-08-14 14:56 UTCGHSA enrichment
  21. 2026-08-14 11:15 UTCGHSA enrichment
  22. 2026-08-14 07:35 UTCEG score recompute
  23. 2026-08-14 07:35 UTCGHSA enrichment
  24. 2026-08-13 02:13 UTCGHSA enrichment
  25. 2026-08-12 22:32 UTCEG score recompute
Show 75 more
  1. 2026-08-12 22:32 UTCGHSA enrichment
  2. 2026-08-12 13:46 UTCEPSS rescore
  3. 2026-08-12 01:20 UTCGHSA enrichment
  4. 2026-08-11 21:39 UTCEG score recompute
  5. 2026-08-11 21:39 UTCGHSA enrichment
  6. 2026-08-11 13:36 UTCEPSS rescore
  7. 2026-08-11 08:38 UTCGHSA enrichment
  8. 2026-08-11 04:47 UTCEG score recompute
  9. 2026-08-11 04:47 UTCGHSA enrichment
  10. 2026-08-10 12:17 UTCGHSA enrichment
  11. 2026-08-10 07:50 UTCGHSA enrichment
  12. 2026-08-10 04:10 UTCGHSA enrichment
  13. 2026-08-10 00:27 UTCGHSA enrichment
  14. 2026-08-09 20:46 UTCGHSA enrichment
  15. 2026-08-09 17:06 UTCEG score recompute
  16. 2026-08-09 17:06 UTCGHSA enrichment
  17. 2026-08-09 13:42 UTCEPSS rescore
  18. 2026-08-09 13:26 UTCGHSA enrichment
  19. 2026-08-09 07:12 UTCEG score recompute
  20. 2026-08-09 07:12 UTCGHSA enrichment
  21. 2026-08-08 16:32 UTCEPSS rescore
  22. 2026-08-08 08:34 UTCGHSA enrichment
  23. 2026-08-08 04:54 UTCGHSA enrichment
  24. 2026-08-08 01:13 UTCGHSA enrichment
  25. 2026-08-07 21:33 UTCGHSA enrichment
  26. 2026-08-07 17:52 UTCEG score recompute
  27. 2026-08-07 17:52 UTCGHSA enrichment
  28. 2026-08-06 19:45 UTCEG score recompute
  29. 2026-08-06 19:45 UTCGHSA enrichment
  30. 2026-08-06 13:42 UTCEPSS rescore
  31. 2026-08-06 09:12 UTCGHSA enrichment
  32. 2026-08-06 05:30 UTCGHSA enrichment
  33. 2026-08-06 01:50 UTCEG score recompute
  34. 2026-08-06 01:50 UTCGHSA enrichment
  35. 2026-08-05 19:12 UTCEPSS rescore
  36. 2026-08-04 15:04 UTCEPSS rescore
  37. 2026-08-04 10:32 UTCEPSS rescore
  38. 2026-08-04 04:51 UTCGHSA enrichment
  39. 2026-08-04 01:05 UTCEG score recompute
  40. 2026-08-04 01:05 UTCGHSA enrichment
  41. 2026-08-03 01:15 UTCGHSA enrichment
  42. 2026-08-02 20:51 UTCGHSA enrichment
  43. 2026-08-02 17:10 UTCEG score recompute
  44. 2026-08-02 17:10 UTCGHSA enrichment
  45. 2026-08-02 02:22 UTCEPSS rescore
  46. 2026-08-01 04:11 UTCEPSS rescore
  47. 2026-07-30 16:23 UTCEPSS rescore
  48. 2026-07-30 01:26 UTCEPSS rescore
  49. 2026-07-28 15:31 UTCEPSS rescore
  50. 2026-07-28 02:25 UTCEG score recompute
  51. 2026-07-28 02:25 UTCGHSA enrichment
  52. 2026-07-26 14:50 UTCEPSS rescore
  53. 2026-07-25 14:13 UTCEPSS rescore
  54. 2026-07-23 14:14 UTCEPSS rescore
  55. 2026-07-23 01:22 UTCEG score recompute
  56. 2026-07-22 22:01 UTCEG score recompute
  57. 2026-07-22 14:04 UTCEPSS rescore
  58. 2026-07-21 15:21 UTCEPSS rescore
  59. 2026-07-21 15:21 UTCEPSS rescore
  60. 2026-07-20 17:03 UTCEPSS rescore
  61. 2026-07-19 14:27 UTCEPSS rescore
  62. 2026-07-19 02:26 UTCEPSS rescore
  63. 2026-07-19 02:26 UTCEPSS rescore
  64. 2026-07-18 10:00 UTCEPSS rescore
  65. 2026-07-18 10:00 UTCEPSS rescore
  66. 2026-07-16 16:59 UTCEPSS rescore
  67. 2026-07-16 16:59 UTCEPSS rescore
  68. 2026-07-15 16:54 UTCEPSS rescore
  69. 2026-07-15 16:54 UTCEPSS rescore
  70. 2026-07-15 01:56 UTCEPSS rescore
  71. 2026-07-15 01:56 UTCEPSS rescore
  72. 2026-07-13 22:26 UTCEPSS rescore
  73. 2026-07-13 06:09 UTCEPSS rescore
  74. 2026-07-12 05:43 UTCEPSS rescore
  75. 2026-07-12 05:43 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2016-20026?
CVE-2016-20026 is a critical vulnerability published on March 16, 2026. ZKTeco ZKBioSecurity 3.0 contains hardcoded credentials in the bundled Apache Tomcat server that allow unauthenticated attackers to access the manager application. Attackers can authenticate with hardcoded credentials stored in tomcat-users.xml to upload malicious WAR archives containing JSP…
When was CVE-2016-20026 disclosed?
CVE-2016-20026 was first published in the National Vulnerability Database on March 16, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-20026 actively exploited?
CVE-2016-20026 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 46.4% of all scored CVEs.
What is the CVSS score of CVE-2016-20026?
CVE-2016-20026 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2016-20026?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-20026, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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